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Deciding Whether to Treat

Now that you can recognize and measure overactive tone, the harder question arrives: should you lower it at all? Meet the goals that make tone treatment worthwhile — function, comfort, hygiene, positioning, contracture prevention — and the counter-intuitive truth that some stiffness is doing useful work, so that sometimes the wisest move is to leave it alone.

The question that comes before treatment

In the earlier guides of this rung you learned to recognize the upper motor neuron syndrome and to put a number on overactive tone with tools like the modified Ashworth scale. It is natural to assume the next step is obvious: a limb is too stiff, so we make it relax. But the experienced clinician hesitates here, and that hesitation is the whole point of this guide. Before reaching for any treatment, they ask a harder question — what would relaxing this limb actually buy this person, and what might it cost? Tone management is not a campaign to abolish stiffness. It is a careful weighing of where reducing tone helps and where the very same tone is doing useful work.

There is a deep reason the question matters. Remember that spasticity is only the loudest of the positive features of the upper motor neuron syndrome — the extra activity that is easy to see and feel. Underneath it sit the quiet negative features: weakness, slowness, loss of fine control, fatigue. A spastic arm is almost never a strong arm with too much tone added on. It is a weak arm, and the stiffness is sitting on top of the weakness. That single fact reshapes everything, because it means lowering the tone does not give you the limb back as it was before — it only changes how the weakness underneath shows up.

What we are actually trying to win

When treating tone is the right call, the legitimate reasons fall into a handful of buckets, and naming them keeps a team honest. The first is function: a hand that opens enough to grasp a cup, a leg that swings through cleanly enough to clear the floor and take a step. The second is comfort: relief from the painful muscle spasms that can jolt a person awake at night or make a wheelchair unbearable to sit in. These two are what families usually picture, but in real clinics they are far from the most common reasons to treat.

Three quieter goals do most of the day-to-day work. Hygiene and care: a fist clenched so tightly the palm cannot be cleaned or the nails cut, an armpit or groin pulled shut and macerating, a body that fights every attempt to dress it. Positioning: a person who slides out of a wheelchair because extensor tone keeps pushing them forward, or whose limbs pull into postures that ruin sitting balance. And contracture prevention: stopping the slow, silent drift of an overactive joint toward a fixed, shortened joint contracture that no injection or stretch can later undo. Notice that several of these goals serve the caregiver and the body's integrity, not the patient's own movement — and that is entirely legitimate. A goal does not have to be 'walk again' to be worth pursuing.

GOALS OF TONE MANAGEMENT (treat tone only to serve one of these)
  1. Function   -> grasp, reach, step, swing the leg through
  2. Comfort    -> ease painful spasms, sleep, sitting tolerance
  3. Hygiene    -> open the palm/axilla/groin to clean, dress, cut nails
  4. Positioning-> sit upright without sliding; lie/sit in good posture
  5. Prevention -> halt drift of an overactive joint toward fixed contracture

If a stiff limb causes none of the above -> there may be nothing to treat.
The five buckets of legitimate goals. If none apply, the honest answer may be to do nothing.

The counter-intuitive part: some stiffness is doing a job

Here is the idea that surprises almost everyone, and the reason this guide exists. Spasticity is not purely a problem to be removed — some of it is load-bearing. Recall that the limb underneath is weak. When a leg has lost much of its voluntary strength, a steady extensor stiffness can stand in for the muscle that no longer fires on command. That stiffness is what lets the person lock the knee, bear weight on the leg, stand up from a chair, and pivot in a compensatory transfer. The tone is, quite literally, holding them up.

Picture a man recovering from a stroke who comes to clinic asking the team to 'get rid of' the stiffness in his weak leg, because it feels heavy and awkward. It would be easy to oblige. But on examination the team finds that he relies on exactly that stiffness to stand and to pivot during transfers; without it, his weak quadriceps cannot hold the knee, and the leg buckles. Reduce that extensor tone broadly and he would have a looser, more comfortable-feeling leg — that could no longer carry him. The honest course is not to grant his first request. It is to treat only the tight calf that catches his toe and trips him, while deliberately leaving the supporting tone that keeps him on his feet.

This is why a careful clinician separates the trunk and the limbs, and even one muscle from its neighbor. Useful and harmful tone can live a few centimeters apart in the same leg. Extensor tone that stabilizes the knee for standing is a friend; a tight calf that points the toe down and snags it during swing is a foe. The skill is not 'reduce tone' but 'reduce this tone here, and protect that tone there' — which is exactly why focal, targeted treatments are often preferred over anything that floods the whole body and cannot tell the helpful tone from the harmful.

When the right answer is to leave it alone

Put the two halves together and a clear rule emerges. Treat tone only where it causes a defined problem; leave it where it earns its keep. A high Ashworth number, on its own, is not a reason to treat anything. A limb can score a 3 and yet bother no one — it is not painful, it does not block hygiene or dressing, it is not sliding the person out of their chair, it is not on a path to contracture, and the person is not trying to use that limb for a task it is preventing. If a stiff limb causes none of the problems in our five buckets, there may simply be nothing to treat, and the wisest, most respectful move is to do nothing and watch.

There is one more honest caveat that protects the patient from over-treatment. A sudden jump in tone is itself a clue, not just a target. Spasticity that flares up over a few days often has a trigger sitting underneath it — a urinary infection, a pressure sore, a full bladder or impacted bowel, an ingrown toenail, a fracture. The cord is amplifying a noxious signal it can no longer route to consciousness. Chasing that flare with more and more tone-lowering treatment while ignoring the cause is both useless and dangerous. The first response to worsening tone is to look for what changed, treat that, and only then decide whether the residual tone needs anything at all.

From muddle to a shared, specific goal

Because tone can help and harm at once, the goal has to be written down before any tool is chosen — never the other way around. 'Reduce the tone' is not a goal; it has no finish line and no way to know whether you helped. A real goal is specific, functional, and agreed by the patient, the family, and the team together. 'Open the palm enough to clean it and cut the nails.' 'Let the foot clear the floor so he stops tripping.' 'Stop the elbow drifting past 90 degrees into contracture.' This is the SMART goal discipline you met in the Foundations rung, now doing real work: it turns a vague wish into something you can measure before and after, and it keeps everyone aiming at the same outcome.

  1. Find the problem, not the number. Ask what the tone is actually preventing or causing — a task, pain, a hygiene struggle, a slide out of the chair, a joint heading for contracture. No problem in those buckets, no treatment.
  2. Check what the tone is doing for the person. Test whether they lean on that stiffness to stand, transfer, or hold a posture before you plan to lower it.
  3. Rule out a hidden trigger. If the tone recently jumped, search for and treat the cause — infection, pain, a full bladder or bowel — before treating the tone itself.
  4. Write a shared, specific goal. State the functional change you and the patient want in plain words, so you can judge afterward whether you reached it.
  5. Only now pick the tool — and match its reach to the goal, favoring focal treatment when only one muscle is the problem. (The next guides walk through those tools.)

Once the goal is on paper, you can also judge honestly whether you reached it, using a tool like goal attainment scaling rather than the Ashworth number alone — because a treatment that drops the tone but does not open the palm has not done its job. That is the thread holding this whole rung together: rehabilitation restores function rather than curing the lesion, and tone is just one lever among many. Lower it where a defined problem demands it, protect it where it is quietly holding someone up, and you will already think about spasticity more wisely than the instinct to simply make every stiff limb relax.